SEMICLASSICAL STUDY OF DOUBLE-LAMBDA LASER WITHOUT INVERSION

Lasing without inversion in the 'double-lambda' scheme is studied for arbitrary single-mode cavity linewidth. Former simplified analytic the ory is tested against full numerical solution of the semiclassical las er equations. An improved analytic approach is proposed which takes in to account the leading nonresonant terms. It is shown that the simple interpretation of lasing in the dressed states picture works well only in the vicinity of the laser threshold or for such a strong driving t hat a large separation between the dressed states of the system assure s little competition of different polarizations induced in the medium.